Evaluation of enthalpy change due to hydrogen desorption for lithium amide/imide system by differential scanning calorimetry

Shigehito Isobe, Takayuki Ichikawa, Kazuhiko Tokoyoda, Nobuko Hanada, Haiyan Leng, Hironobu Fujii, Yoshitsugu Kojima

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Enthalpy change (ΔH) due to hydrogen desorption (H-desorption) for the lithium amide/imide system was evaluated by differential scanning calorimetry (DSC) measurement. In order to obtain the accurate and precise value of ΔH, we have paid special attention to following two points for correcting raw experimental data. One is to determine a cell constant of DSC equipment, which was evaluated by using the TiO2-doped MgH2 compound as a reference because of its quite similar hydrogen desorption properties to that of the lithium amide/imide system. The other is to estimate the sample amount corresponding to the H-desorption reaction from weight loss in the thermogravimetric (TG) analysis. By performing both the corrections, the ΔH value due to the H-desorption reaction from LiNH2 + LiH to Li2NH + H2 was evaluated to be 67 kJ/mol H2.

Original languageEnglish
Pages (from-to)35-38
Number of pages4
JournalThermochimica Acta
Volume468
Issue number1-2
DOIs
Publication statusPublished - 2008 Feb 5

Keywords

  • Calorimetry
  • Gas-solid reactions
  • Hydrogen absorbing materials
  • Thermal analysis

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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